Question

how do plants and animals help each other in exchange of gases in the atmosphere?

Answer 1

plants need carbon-dioxide (CO2) and human need oxygen(O2) they both help each other in such a way that human releases CO2 into atmosphere and plants release oxygen into atmosphere these gases are taken by them which are released into atmosphere

Answer 2

The CO2 produced by humans is taken by plants which in turn release oxygen for animals.It occurs when the alveolar pressure of PO2 is more in atmoshphere as comapard to body tissues.